Short answer: a long time, and often longer than the warranty period.
Enphase batteries are designed for daily use and long-term reliability, and they come with a 15-year warranty, which is a strong indicator of expected lifespan.
What the industry sees in practice Across the industry, the general view is that high-quality home batteries, particularly those using lithium iron phosphate (LFP) chemistry, are likely to continue operating well beyond their warranty period. Rather than failing suddenly, batteries tend to age gradually, storing a little less energy over time while remaining perfectly usable.
Why Enphase batteries are built to last Enphase batteries combine:
LFP chemistry, known for stability and long cycle life
Built-in inverters and intelligent software, which carefully manage charge rates, temperatures, and depth of discharge
A modular architecture, which spreads load and reduces stress on individual components
All of this helps extend usable life.
The warranty as a benchmark The 15-year warranty reflects confidence in long-term performance under real-world daily use. Many in the industry see this as a conservative baseline rather than an end date.
The takeaway An Enphase battery is a long-term energy asset. Based on its design and industry experience, it’s reasonable to expect useful performance for many years beyond the warranty period.
